642 TRAVEL IN EUROPE AND AMERICA. (1873, 
hood of Sarracenia flava, which answers to what my 
Southern correspondent pointed out; but is not very 
marke e. 
CAMBRIDGE, July 7. 
. L have also seen here that water is secreted in 
the pitahee of Sarr. flava before the lid is open. 
But I have also seen some time ago, when the 
weather got rather warm, very minute globules like 
finest dew on the erect part of the lid, near base, in- 
side. And, lately, during the very warm days, I found 
in some this increased, and the droplets running to- 
gether into a clammy exudation. But I want to see 
more of it. I shall watch, as I get a chance, and the 
weather gets hot. Look at yours. See if there is 
anything of the sort in S. purpurea; I think not. 
I have not the book yet. But I somehow under- 
stand that this exudation on the lid is mentioned in 
the English translation of Le Maout and Decaisne’s 
“General Treatise of Botany!” The French has it 
not. Very likely it has been found out by Darwin, 
who finds out everything! 
onundrum? Why does the Dionza trap 
close only part way, so as to cross the bristles of edge 
only, at first, and afterwards close fully ? 
Darwin has hit it. I wonder you or I never thought 
of it. A. Ge 
TO A. DE CANDOLLE. 
CAMBRIDGE, October 27, 1875. 
My pear De Canpouie, — If I were a better 
correspondent, I should have long ago thanked you 
for your interesting and welcome letter of August 11, 
from Samaden. I was in the Engadine when last in 
Switzerland, and got near the top of Piz Langarde, 
when a storm drove me back. 
~~ 
